I've been using the same gallon of mold max 30 for 5 years, opened, and it's still making good molds. I also use the silicone thinner, so that probably helps. I put a little of the thinner into the gallon pail every time I'm done with it. However, it's getting on towards time to get a new gallon, I think.

-Downwood

HA: 40, 41, 42, 43, 44, 45, 52, 53, 54, 55, 56, 60, 61, 62, 63, 64, 65, 70, 74, 80, 85, 93, 94, 95, 96, 97, 98, 99, 164, 200, 201, 202, 203, 205, 210, 212, 220, 230, 235, 240, 250, 260, 281, 282, 290, 292, 300